Handle claiming winback offer

[MiSikora]

Description

This PR adds claiming Winback offer Right now it is available only in staging due to Winback codes being available only there.

Testing Instructions

1. Apply this winback.patch.
2. Install the debugProd variant of the app.
3. Sign in with an account without a subscription.
4. If it is a new account wait for 3 minutes to make it old enough in the staging environment to make it eligible for the Winback offer.
5. Subscribe to any plan.
6. Go to the account details.
7. Tap on "Cancel subscription".
8. You should see a Winback offer.
9. Tap on the Claim button.
10. Play Store sheet should appear.
11. Close the sheet without making a purchase.
12. There should no loading dialog on top of UI.
13. Claim the offer again.
14. Finish the flow.
15. You should see the confirmation screen.

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• Ensure the linter passes (./gradlew spotlessApply to automatically apply formatting/linting)
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• Any jetpack compose components I added or changed are covered by compose previews
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

I have tested any UI changes...

• with different themes
• with a landscape orientation
• with the device set to have a large display and font size
• for accessibility with TalkBack

[wpmobilebot]

📲 You can test the changes from this Pull Request in 📱 Mobile by scanning the QR code below to install the corresponding build.

	App Name	📱 Mobile
	Build Type	debugProd
	Commit	ae19d4d
	Direct Download	pocketcasts-app-prototype-build-pr3551-ae19d4d.apk

📲 You can test the changes from this Pull Request in 🚗 Automotive by scanning the QR code below to install the corresponding build.

	App Name	🚗 Automotive
	Build Type	debugProd
	Commit	ae19d4d
	Direct Download	pocketcasts-automotive-prototype-build-pr3551-ae19d4d.apk

📲 You can test the changes from this Pull Request in ⌚ Wear by scanning the QR code below to install the corresponding build.

	App Name	⌚ Wear
	Build Type	debugProd
	Commit	ae19d4d
	Direct Download	pocketcasts-wear-prototype-build-pr3551-ae19d4d.apk

[mebarbosa]

10. Play Store sheet should appear.

I followed all steps, but I am not seeing this one. I am seeing the Enjoy your free month screen instead

[MiSikora]

I followed all steps, but I am not seeing this one. I am seeing the Enjoy your free month screen instead

I think you might be testing with a wrong branch.

[mebarbosa]

LGTM!